package d;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.Socket;
import java.net.SocketException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 86183
 * Date: 2024-04-27
 * Time: 22:11
 */
public class UdpEchoServer {
    DatagramSocket socket = null;
    public UdpEchoServer(int port) throws SocketException {
        socket = new DatagramSocket(port);
    }
    public void start() throws IOException {
        System.out.println("服务器启动!");
        while(true){
            DatagramPacket requestPacket  = new DatagramPacket(new byte[4096],4096);
            socket.receive(requestPacket);
            String request = new String(requestPacket.getData(),0,requestPacket.getLength());
            String response = process(request);
            DatagramPacket responsePacket = new DatagramPacket(response.getBytes(),0,response.getBytes().length,
                    requestPacket.getAddress(),requestPacket.getPort());
            socket.send(responsePacket);
            System.out.printf("[%s :%d ] req = %s ,resp = %s \n" ,requestPacket.getAddress(),requestPacket.getPort(),
                    request,response);
        }

    }
    public String process(String resquest){
        return resquest;
    }
    public static void main(String[] args) throws IOException {
        UdpEchoServer udpEchoServer = new UdpEchoServer(9090);
        udpEchoServer.start();

    }
}
